William t



@einen gisten gatenit @fitta WlljlilAM TUOL'E, OF NEW YORK, N. Y., ASSIGNGR T0 HlltlSELll, JACOB F. HUNTER, AND IIJTER l. KELLER, OF THE SAME PLACE.

Letters Patent NOJGQJS-l, dated September 2l, 1867.

IMPROVEMENT IN GI-IUOKS,

l ein Stimuli winnt .tu it. der irtlas kunt mit maling nrt .et tigt anni.

TO ALL WI'IOM IT MAY CONCERN:

Bc it known that I, WILLIAM T. Goth, of the city, county, and State et' New York, have invented a new and useful Improvement in Chucks; and I de hereby declare that the following is a full, clear, and exact description thereof, which will vcreible others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 represents a face View of improved chuck.

Figure 2 is a similar View, the oscilla-ting faceplate being removed.

Figure 3 is a view similar to iig. l, showing a modication in the construct-ion of the pawls.

Figure 4 is a central section through my improved chuck, the plane of section being indicated bythe line :c m, iig. 2.

Similar letters of reference indicate corresponding parts.

This invention consists in fitting upon the face of a revolving disk or box ltwo or more pawls, which are pivoted to the face of the disk, and extend towards the centre of the disk to a central aperture thereon,

through which aperture the tubes or rods, or other articles to be held, are passed. The ends of the pawls are so arranged that they can be turned away 'from the aforesaid central aperture, and that, when thrown upon the shaft, they will, when pressure is applied to the shaft or pipe by a tool or otherwise, be carried by the sha-ft towards the radial line of the sha-ft and disk, and'will thus be made to clamp the shaft or pipe the tighter, the `more pressure is applied to the same. For this purpose the pawls are made a little longer than the distance from their pivots to the periphery of the shaft.

A represents a cylindrical box, open at one end, and secured to the hollow spindle ol' a suitable lathe, so as to revolve with the same. The back of the box A has a cent-ral aperture, the diameter of the hele being alittle larger than that ot' the pipe or shaft to be held. B B is aseries of pawls, their number being regulated by the size of the machinery, and by the amount of strain to be brought against them. Each of these pawls has a knucklet, at its outer end, which lits into a corresponding recess in the back of the box A, as shown in iig. 2. Projecting from the side of each pztwl is a pin, b', whiclr passes through a hole i'n an oscillating plate, O, t which is iitted within the front edges of` the box A. The plate C is provided with a handle, c, by which it is moved or oscillated. The plate C is also provided with curved slats d, which passthrough the pins er screws e, which are attached tothe back of the box A. These screws serve to govern the oscillation of plate C, and l also to attach it to the box. By means of the handle c the plate C is turned, and with it the pawls B are moved to or from the central aperture ot' the box A, the movement of the pawls being occasioned by the pins Z1, which work in holes in the plate C, as before described. The inner ends of the pawls may be formed with single points, as in iig. 3, or, as in iig. 2, with double points. When formed with double peints the pawls will be adapted te hold the shaft when the same is turned in cit-her direction, as is clearly indicated by red and black lines in iig.l 2. As the pawls are longer than the distance between the centres on which they turn, and the periphery of the shaft, they will, when power is applied to the shaft, tube, or rod, by a tool or otherwise, be carried nearer to the ,radial line in the same ratio as the force acting against the shaft, tube, or rod is increased, and consequently they will bite the tighter upon the shaft the heavier the strain of the tool. When Itwo points are on the pawls, as in fig. 2, they will hold, when the shaft is turned in either direction, while with one point they will only hold the shaft when it turns in the direction of the arrow in iig. 3. r The manner herein described of securing or hinging the pawls can be varied. For making the apparatus adjustable to diil'erent-sized shafts, the back ofthe box may be slotted, and hold the pivots ofthe pawls in these slots. In this case bushings would have to bc provided for the hole in the centre of the disk A.

The invention is particularly applicable for holding pipes on the end of which a screw-thread is to bc cut. In such a case the pipe is inserted through the central apcrturelof the box A, the pawls nre applied, and the pipe will be carried aroundby vthe lathe; the thread is then cut, and when cut the pipe can be disengaged from the lathe by a slight move of the handle, and without stopping the machine. The pipe, when readjusted, can be again clamped by another short move of the handle. By reversing the machine the pipe is also released. Of all the chucks nowin use none are fitted to allow the disengaging` of the pipe or shaft while in motion.

I claim as new, and desire to secure by Letters Patent- The combination of the pawls B, oscillating plate C, and revolving box A, all constructed and operating substantially as herein shown and described.

WILLIAM T. COLE. Witnesses:

WM. F. MCNAMARA, ALEX. F. Renners. 

